Connecting a Mac and Windoze laptop to WRT54g

I'm new to this wireless router business.
I have a WRT54G (v2.2) hooked up to my cable modem. I'm able to connect to the internet with my Powerbook (Mac OS X 10.3.8, Airport Express) OR with my wired Windows 2000 laptop. But, the wireless powerbook and wired laptop don't work together. The lights go crazy on the router. Linksys support wasn't able to help much.

Do I need to use MAC cloning? Is there a particular sequence I need to follow to hook up both machines?
Thanks for any tips.

Hmm.. I assume you are talking about having both laptops connect to the router at the same time and then access the internet. I am not sure why you are having trouble when both are connected... Have you tried connecting both at the same time via wire?

If you are talking about filesharing then, sorry no clue here on cross platform sharing.

Thanks Bluedog.
You're right. I'm simply trying to connect with both laptops to the internet at the same time. Spent a couple of hours with linksys tech support. In the end they suggested doing an exchange. I'll try that and post the results.

Comcast cable assigns the IP. I haven't noticed if it is changes after every reboot or renewal.

It was probably a bum router. It worked after I got it replaced.
I set up the wired laptop first.
Then, from the router admin page I set up access rights for my wireless powerbook.
Powered it up and was on the internet in no time.